同步两个域之间的cookie值的问题
这是完善上个问题代码不全的问题，首先我按照老师的建议修改DetailServlet中的HttpPost httpPost = new HttpPost("http://localhost:8080"+server + "/" + method);
但是BrowseServlet还是拦截不了/browse/setCookie.do，下面是我这几个页面用到的代码
tomcat设置页面
LocalCache
package cache;
import entity.Product;
import java.util.*;
/**
* 本地数据加载库
*/
public class LocalCache {
//产品的数据集合
private static Map<Long, Product> productMap = new HashMap<>();
//模拟本地数据库
static {
productMap.put(1L, new Product(1l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(2l, new Product(2l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(3l, new Product(3l, "JAVA", "JAVA基础课程-基本语法", "介绍java基本语法特性及编写规范", "初级", 219));
productMap.put(4l, new Product(4l, "JAVA", "JAVA基础课程-JDBC", "介绍JDBC方式连接数据库", "初级", 219));
productMap.put(5l, new Product(5l, "JAVA", "JAVA基础课程—Socket", "介绍Java网络编程Socket", "初级", 219));
productMap.put(6l, new Product(6l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(7l, new Product(7l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(8l, new Product(8l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(9l, new Product(9l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(10l, new Product(10l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(11l, new Product(11l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(12l, new Product(12l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(13l, new Product(13l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(14l, new Product(14l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(15l, new Product(15l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(16l, new Product(16l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(17l, new Product(17l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(18l, new Product(18l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(19l, new Product(19l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(20l, new Product(20l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(21l, new Product(21l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(22l, new Product(22l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(23l, new Product(23l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(24l, new Product(24l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
productMap.put(25l, new Product(25l, "HTML/CSS", "HTML+CSS基础课程", "HTML+CSS基础教程8小时带领大家步步深入学习标签用法和意义", "初级", 219));
}
//数据库的读写方式
private LocalCache(){
}
//得到数据库的商品集合
public static List<Product> getProductMap(){
return new ArrayList<Product>(productMap.values());
}
//通过序号Id得到商品的方法
public static Product getProduct(Long id){
return productMap.get(id);
}
//判断序号id在集合中是否存在
public static boolean isEmptyId(Long id){
return productMap.containsKey(id);
}
}ProduceService
package service;
import cache.LocalCache;
import entity.Product;
import java.util.ArrayList;
import java.util.List;
/**
* 商品管理的处理类
*/
public class ProduceService {
//得到商品数据总集合的方法
public static List<Product> getProducts(){
return LocalCache.getProductMap();
}
//通过id得到商品的方法
public static Product getProduct(Long productId){
//查询id是否存在
if(LocalCache.isEmptyId(productId)){
return LocalCache.getProduct(productId);
}
return null;
}
//通过页数取得对应商品的方法
public static List<Product> getPageProduct(int page,int size,String title){
//调用得到商品数据总集合的方法
int totalProducts =getProductCount(title).size();
int start = (page - 1) * size ;
int end = totalProducts > page*size ? page*size : totalProducts ;
return getProductCount(title).subList(start,end);
}
//通过查询的字符获得商品个数的方法
public static List<Product> getProductCount(String title){
List<Product> productList = new ArrayList<>();
if(null != title && !"".equals(title)){
//当传进来的name不为空，遍历当前集合
getProducts().forEach(product -> {
//当商品的名称包含有name添加到集合中
if(product.getName().contains(title)){
productList.add(product);
}
});
}else {
//name为空时，添加全部商品集合
productList.addAll(getProducts());
}
return productList;
}
}DetailServlet
package servlet;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import service.ProduceService;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Objects;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class DetailServlet extends HttpServlet {
//创建java线程池对象，创建10个线程池
private ExecutorService service = Executors.newFixedThreadPool(10);
//实现同步cookie的方法
private void syncCookie(String server, String method, String cookies) {
//调用提交的方法
service.submit(new Runnable() {
@Override
public void run() {
//post请求调用
HttpPost httpPost = new HttpPost("http://localhost:8080"+server + "/" + method);
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
try {
httpClient = HttpClients.createDefault();
response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "utf-8");
System.out.println("==============" + responseContent);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != response) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != httpClient) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
if (Objects.equals("/detail/detail.do", req.getServletPath())) {
//为list界面传来请求
String productId = req.getParameter("productId");
if (null != productId && !"".equals(productId)) {
//声明一个existCookie
Cookie existCookie = null;
//遍历系统存在的cookie
//从cookie中取出所有数据
for (Cookie cookie : req.getCookies()) {
if (Objects.equals("productIds", cookie.getName())) {
//当cookie与产品id匹配时
existCookie = cookie;
break;
}
}
//当existCookie为空时
if (null == existCookie) {
//新建一个cookie
existCookie = new Cookie("productIds", productId);
//调用同步coookie的方法
syncCookie("/browse", "setCookie.do", productId);
} else {
//把productIds中的productId提取出来
String[] productIds = existCookie.getValue().split("%2C");
if (!"".equals(productIds)) {
/**
* 当productIds不为""字符串时
* 定义一个boolean控制是否添加新的cookie
*/
StringBuilder stringBuilder = new StringBuilder();
Boolean addCookieFlag = false;
//遍历数组
for (String cookieId : productIds) {
//当cookie存在于原有cookies时，为真
Boolean cookieFlag = false;
if (cookieId.equals(productId)) {
//当productId与原有id匹配
cookieFlag = true;
}
//反馈addCookieFlag是否添加新的cookie
addCookieFlag = cookieFlag || addCookieFlag;
}
//根据addCookieFlag来决定是否添加新cookie
if (addCookieFlag) {
//存在即设置为原有cookie
existCookie.setValue(existCookie.getValue());
//把cookie值设置进session作用域
req.getSession().setAttribute("cookies",existCookie.getValue());
//调用同步cookie的方法
syncCookie("/browse", "setCookie.do", existCookie.getValue());
} else {
//不存在添加新cookie
for (String cookieId : productIds) {
//把原有id添加到stringBuilder
stringBuilder.append(cookieId + "%2C");
}
//添加新的cookie
stringBuilder.append(productId + "%2C");
//为cookie设置新的值
existCookie.setValue(stringBuilder.toString());
//把cookie值设置进session作用域
req.getSession().setAttribute("cookies",existCookie.getValue());
//调用同步cookie的方法
syncCookie("/browse", "setCookie.do", stringBuilder.toString());
}
}
}
//把cookie添加到当前服务器
resp.addCookie(existCookie);
//把id匹配到的产品放到request中
req.setAttribute("product", ProduceService.getProduct(Long.valueOf(productId)));
//转发回详情页面
req.getRequestDispatcher("/WEB-INF/views/biz/detail.jsp").forward(req, resp);
}
} else if (Objects.equals("/detail/removeCookie.do", req.getServletPath())) {
//接收cookie的值
String cookies = req.getParameter("cookies");
//把cookie写入response作用域中
resp.addCookie(new Cookie("productIds", cookies));
resp.setCharacterEncoding("UTF-8");
resp.setContentType("application/text;charset=utf-8");
//写入输出流
PrintWriter out = null;
try {
out = resp.getWriter();
out.write("ok");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != out) {
out.close();
}
}
}
}
}BrowseServlet
package servlet;
import entity.Product;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import service.ProduceService;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* 浏览记录servlet
*/
public class BrowseServlet extends HttpServlet {
//创建java线程池对象，创建10个线程池
private ExecutorService service = Executors.newFixedThreadPool(10);
//实现同步cookie的方法
private void syncCookie(String server, String method, String cookies) {
//调用提交的方法
service.submit(new Runnable() {
@Override
public void run() {
//post请求调用
HttpPost httpPost = new HttpPost(server + "/" + method+"?cookie="+cookies);
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
try {
httpClient = HttpClients.createDefault();
response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "utf-8");
System.out.println("==============" + responseContent);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != response) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != httpClient) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println(req.getServletPath());
if (Objects.equals("/browse/list.do", req.getServletPath())) {
String cookieProducts = null;
List<Product> productList = new ArrayList<>();
//从cookie中取出所有数据
for (Cookie cookie : req.getCookies()) {
if (Objects.equals("productIds", cookie.getName())) {
//把产品id提取出来
cookieProducts = cookie.getValue();
break;
}
}
if (null != cookieProducts && !"".equals(cookieProducts)) {
//把cookieProducts中的productId提取出来
String[] productIds = cookieProducts.split("%2C");
for (String productId : productIds) {
//调用得到商品的方法
productList.add(ProduceService.getProduct(Long.valueOf(productId)));
}
}
//把productList放进request中
req.setAttribute("products", productList);
//转发回浏览记录页面
req.getRequestDispatcher("/WEB-INF/views/biz/browse_list.jsp").forward(req, resp);
} else if (Objects.equals("/browse/delete.do", req.getServletPath())) {
//为删除浏览记录商品请求
String productId = req.getParameter("productId");
if (null != productId && !"".equals(productId)) {
//从cookie中取出所有数据
for (Cookie cookie : req.getCookies()) {
if (Objects.equals("productIds", cookie.getName())) {
//把productIds中的productId提取出来
String[] productIds = cookie.getValue().split("%2C");
StringBuilder stringBuilder = new StringBuilder();
for (String cookieId : productIds) {
if (cookieId.equals(productId)) {
continue;
}
//把剩下的id要回来
stringBuilder.append(cookieId + "%2C");
}
//为cookie设置新的值
cookie.setValue(stringBuilder.toString());
//调用同步cookie的方法
syncCookie("/detail","removeCookie.do",stringBuilder.toString());
resp.addCookie(cookie);
}
}
//重定向
resp.sendRedirect("/browse/list.do");
}
} else if (Objects.equals("/browse/setCookie.do", req.getServletPath())) {
//为其它应用传来的setCookie请求
String cookies = req.getParameter("cookies");
//把cookie写入response作用域中
resp.addCookie(new Cookie("productIds", cookies));
resp.setCharacterEncoding("UTF-8");
resp.setContentType("application/text;charset=utf-8");
//写入输出流
PrintWriter out = null;
try {
out = resp.getWriter();
out.write("ok");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != out) {
out.close();
}
}
}
}
}web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <!--欢迎页面--> <welcome-file-list> <welcome-file>/index.jsp</welcome-file> </welcome-file-list> <!--过滤器--> <filter> <filter-name>CharsetFilter</filter-name> <filter-class>filter.CharsetFilter</filter-class> <init-param> <param-name>charset</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharsetFilter</filter-name> <url-pattern>*.do</url-pattern> </filter-mapping> <servlet> <servlet-name>ProductServlet</servlet-name> <servlet-class>servlet.ProductServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ProductServlet</servlet-name> <url-pattern>/product/list.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>CartServlet</servlet-name> <servlet-class>servlet.CartServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>CartServlet</servlet-name> <url-pattern>/cart/cart.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>CartServlet</servlet-name> <url-pattern>/cart/decr.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>CartServlet</servlet-name> <url-pattern>/cart/incr.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>CartServlet</servlet-name> <url-pattern>/cart/delete.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>CartServlet</servlet-name> <url-pattern>/cart/list.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>FavoriteServlet</servlet-name> <servlet-class>servlet.FavoriteServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>FavoriteServlet</servlet-name> <url-pattern>/favorite/favorite.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>FavoriteServlet</servlet-name> <url-pattern>/favorite/delete.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>FavoriteServlet</servlet-name> <url-pattern>/favorite/list.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>DetailServlet</servlet-name> <servlet-class>servlet.DetailServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>DetailServlet</servlet-name> <url-pattern>/detail/detail.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>DetailServlet</servlet-name> <url-pattern>/detail/removeCookie.do</url-pattern> </servlet-mapping> <servlet> <servlet-name>BrowseServlet</servlet-name> <servlet-class>servlet.BrowseServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>BrowseServlet</servlet-name> <url-pattern>/browse/list.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>BrowseServlet</servlet-name> <url-pattern>/browse/delete.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>BrowseServlet</servlet-name> <url-pattern>/browse/setCookie.do</url-pattern> </servlet-mapping> <error-page> <error-code>404</error-code> <location>/WEB-INF/views/error/404.jsp</location> </error-page> <error-page> <error-code>500</error-code> <location>/WEB-INF/views/error/500.jsp</location> </error-page> </web-app>
用到的jar包
还有list.jsp和detail.jsp还有browse_list.jsp用的是这节课老师的代码没有修改
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1回答
好帮手慕珊
2018-02-27 15:05:55
我运行了一下这个代码，首先如果直接访问路径localhost:8080/browse/setCookie.do是可以进入到BrowseServlet中执行的
关于syncCookie方法的问题，还是传参的时候出错了，方法形式如下：
第一个参数是server，第二个是web.xml中配置的路径，第三个是cookie的值，调用syncCookie方法的形式如下:
cookie值是我测试时随便写的，你可以根据实际情况获取。
然后HttpPost这样写：
，如果还有cookie值，就要接着拼接字符串，后面有?cookie=xxx类似的内容
也就是HttpPost中的参数拼接好后就是 http://localhost:8080/browse/setCookie.do 这样的链接。
另外，去单点登录的源码中找到这两个jar包导入
祝学习愉快！
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